San Francisco, officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.5 million people which includes San Jose and Oakland. The only consolidated city-county in California, it encompasses a land area of about 46.9 square miles (121 km2) on the northern end of the San Francisco Peninsula, giving it a density of about 17,179 people per square mile (6,632 people per km2). It is the most densely settled large city (population greater than 200,000) in the state of California and the second-most densely populated large city in the United States after New York City. San Francisco is the fourth most populous city in California and the 13th most populous city in the United States, with a population of 805,235 as of the 2010 Census. The San Francisco-Oakland-Fremont metropolitan area has a population of 4,335,391.

New York City is the most populous city in the United States and the center of the New York metropolitan area. The city has a significant impact on global commerce, finance, media, culture, art, fashion, research, education, and entertainment. As host of the United Nations Headquarters, it is also an important center for international affairs. The city is often referred to as ''New York City'' or the ''City of New York'', to distinguish it from the state of New York, of which it is a part. Located on a large natural harbor on the Atlantic coast of the Northeastern United States, New York City consists of five boroughs: The Bronx, Brooklyn, Manhattan, Queens, and Staten Island. 

Santa María Huatulco is a town and municipality in Oaxaca in south-western Mexico. It is part of the Pochutla District in the east of the Costa Region. The meaning of Huatulco, or Guatulco Coatulco is, "where they worship the tree", referring to an ancient legend. Its ecosystem is lowland deciduous and includes mahogany, cedar, cashew and many other species of tree. Wildlife includes squirrel, opossum, skunk, raccoon, coati, ringtail, armadillos, ocelots and white-tailed deer. With many stunning beaches, as well as ecological reserves that contain diverse nesting birds and reptiles, the municipality is also the home of Huatulco National Park. The area is served by Bahías de Huatulco International Airport.

Charleston is a city in the U.S. state of South Carolina and is the second largest city in the state. The city lies just south of the geographical midpoint of South Carolina's coastline and is located on Charleston Harbor, an inlet of the Atlantic Ocean formed by the confluence of the Ashley and Cooper Rivers, or, as is locally expressed, "where the Cooper and Ashley Rivers come together to form the Atlantic Ocean." Founded in 1670 as Charles Town in honor of King Charles II of England, Charleston adopted its present name in 1783, and is defined by its cobblestone streets, horse-drawn carriages and pastel antebellum houses, particularly in the elegant French Quarter and Battery districts. 

Cartagena is Colombia's most famous tourist destination on the Caribbean coast. The city is renowned for its colonial and colourful architecture. With a tropical climate, the city is also a popular beach destination. The city was founded on June 1, 1533, and named after Cartagena, Spain, itself after the original Carthage in Tunisia. However, settlement in this region around Cartagena Bay by various indigenous people dates back to 4000 BC. During the colonial period Cartagena served a key role in administration and expansion of the Spanish empire. It was a center of political and economic activity due to the presence of royalty and wealthy viceroys. In 1984 Cartagena's colonial walled city and fortress were designated a UNESCO World Heritage Site.